Consider a permanentmagnet dc motor with the following param

Consider a permanent-magnet dc motor with the following parameters: R_a = 0.35 Omega, L_a = 1.5mH, k_E = 0.5V(rad/s), k_T = 0.5Nm/A, and J_m = 0.02kg middot m^2. The motor is driving a load whose torque remains constant at 3Nm independent of speed. Neglect friction torque. Calculate the armature voltage V_a to be applied in steady state if this load is to be driven at 1200rpm. 64.93 V 68.59 V 60.74 V 63.86 V Consider a permanent-magnet dc machine with the following parameters: R_a = 0.35 Omega, L_a = 1.5mH, k_E = 0.5V(rad/s), k_T = 0.5Nm/A, and J_m = 0.02kg middot m^2. The machine is driven by a torque which remains constant at 3Nm independent of speed Neglect the friction torque. Calculate the armature voltage V_a to be applied in steady state if the machine rotates at 1200rpm 64.93 V 68.59 V 60.74 V 63.86 V (True or False) Please answer true or false of the following statements about the cascaded closed-loop speed control of a permanent magnet DC motor. The current (torque) loop is the inner loop while the speed loop is the outer loop (T, F) The inner loop has higher cutoff frequency than that of the outer loop (T, F) The speed feedback signal can have a unit of rad/s or rpm (T, F) If the PI controller is chosen for both Inner and outer loops, there are four controller gains to be defined (T, F) Zero steady state speed error can be achieved with PI controller (T, F)

Solution

12.

d)63.86V

13.

d)63.85V

14.

a)True

b)False

c)True

d)True

e)True